I purchased this product to help stabilize my calf. I sustained a calf strain over a year ago. I am now back in a fitness boot camp trying to lose weight. I felt some pain in my calf and bought this. Feels great! I am somewhat heavy so jumping up and down during work outs starting to take its toll. This sleeve was a preventative measure and well worth it!! If you need to use your legs to generate power or lift, this is a great product. It will save anyone from lost time at a gym or fitness boot camps!